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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1987-022-FA

Other ID: STRL S4-87-AFR

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Principal Investigator(s): George R. Driscoll

Affiliate Investigator(s):

Information Specialist(s): George R. Driscoll

Data Type(s): Electro-Magnetic: Gravity, Sonar: Single Beam, Electro-Magnetic: Magnetics, Location-Elevation: Navigation

Scientific Purpose/Goals: Collect gravity and bathymetric data offshore W. Sahara, Mauritania and Senegal on a 3 nm grid with internal consistency +/-3 mgals. The GE 810 correlation sonar was tested around Gran Canaria during the first part of the cruise.


Start Port/Location: Las Palmas, Canary Islands

End Port/Location: Dakar, Senegal

Start Date: 1987-06-12

End Date: 1987-07-17

Equipment Used: GPS (wh), 12 kHz, Magnavox satellite positioning system, LaCoste-Romberg gravimeter G-179, Geometrics G-856 magnetometer, Gyro compass, GE 810 Correlation sonar

Information to be Derived:

Summary of Activity and Data Gathered: Departed Las Palmas, Gran Canaria 12 June 1987 to test General Electric 810 Correlation Sonar along the coast of Western Sahara. On 19 June returned to Las Palmas to offload test personnel and resumed survey along offshore Western Sahara. Survey continued off Mauritania and Senegal. The 810 Sonar/MK 29 Gyro system worked flawlessly. Most lines were cut short on the eastern end due to shoals.

Staff: Barry Irwin, Nancy K. Soderberg, William J. Strahle, Ronald C. Circe, Lester D. North, George R. Driscoll

Affiliate Staff:
Bob Bowles (6/26 - 7/18); Jim McCullough - WHOI (6/12-18); William Bookheimer - General Electric (6/12-18); Amadou T. Diaw - U. Senegal

Notes: Original Center People field contained: George Driscoll, party chief (6/12 - 7/18); Barry Irwin (6/12-24); Ron Circe (6/12-24); Bill Strahle (6/12-18); Nancy Soderberg (6/26 - 7/18); Lester North (6/26 - 7/18).
Project = Defense Mapping Agency Gravity, Defense Mapping Agency Gravity


Canary Islands, Western Sahara, Mauritania, Senegal, Africa, North Atlantic;

North: 26 South: 13 West: -17.5 East: -15


photo of Starella


Folger, D.W., Irwin, Barry J., McCullough, James R., Driscoll, George R., and Polloni, Christopher F., 1990, Map showing free-air gravity anomalies off the western coast of Africa; Western Sahara to Senegal (north of 15 degrees north latitude): U.S. Geological Survey Miscellaneous Field Studies Map MF-2098-C, scale 1:1,500,000.


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
LaCoste-Romberg gravimeter G-179 --- Gravity
12 kHz --- Single Beam
1987-022-FA-SE-001 ( Collection of paper record displays of seismic data( 12K) for lines )
Geometrics G-856 magnetometer --- Magnetics
GE 810 Correlation sonar --- Navigation
Gyro compass --- Navigation
GPS (wh) --- Navigation
Magnavox satellite positioning system --- Navigation

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